Crypto-only payment options. Why?

I sincerely don't understand why some sellers kneecap themselves by only accepting crypto as a payment option.

I never used crypto, it confuses me, so I avoid it. I can't help but wonder about the seller's motivation behind this. To me, an unwillingness to accept traditional payment options sends big red warning flags. I feel like something shady is going on. Am I ignorant of some valid benefits to the overall transaction?

Is it time to educate myself and hop on the crypto train?

Even if I open my mind up to crypto, I still wonder why it would be beneficial to avoid offering other means of payment. I am guessing this method benefits the seller much more than the buyer. No accountability/chargeback in even of scam? This thought leads me to question the motivation.

So why would a seller only offer crypto as a payment method? Surely, at the bare minimum, this significantly shrinks the pool of potential buyers.

Thanks in advance for helping me understand all this.

Eric